Windows: If you like to mix up your Windows wallpaper, the latest version of John's Background Switcher lets you do it from almost any web source, and in any specific way you want to match your monitors.

We've thrown a little love to this clever little freeware app once or twice before, and version 4 of John's Background Switcher (JBS) gives us even more to love. If you've got one monitor and like your pictures scaled a certain way, JBS can do that, but if you've got a batch of photos that some need scaling—one needs a zoomed-in view, and others should be centered—the app can do that too. There's new support for Google, Yahoo, and Bing image search results, background transitions on Vista and Windows 7, and a unified settings dialog for setting up and authorizing your image pools and preferences.

There's also new "cork board" and "postcard" views for creating desktop collages of multiple photos. Best of all for those concerned about resources, JBS can be set to change a desktop picture on every Windows boot-up, then disappear if you don't plan to change more than once per session.